Joint for sewer pipes



Dec. 27, 1949 YOUNG JOINT FOR SEWER/PIPES Filed Oct. 14, 1948 INVENTOR.Nadkarzz'eZ Peyvforz you Patented Dec. 27, 1949 UNITED STATES PATENTOFFICE:

JOINT FOR. SEWER PIPES Nathaniel P. Young, Fairfax, Va.

Application October 14, 1948, Serial No. 54,440

3 Claims.

The object of the present invention is to provide an improved joint forsewer pipes and more particularly for concrete or terra cotta pipe. Thehigh cost of metal pipe, especially in the large sizes required forsewer lines prohibits the use of such pipe and concrete pipe is nowalmost universally used in sewer line construction, especially insuburban areas. In the early stages of the use of concrete pipe forcommunity sewer lines, attention was given primarily to preventingleakage from the interior to the exterior of the lines and any jointsufiiciently water tight to effect that object was deemed to besatisfactory. However with the rapidly increasing density of populationin suburban areas and where the sewerage is being delivered to sewagetreatment plants the problem of preventing infiltration of water fromthe outside to the sewage flow has become of great importance. This isbecause many of the sewage treatment processes involve the use ofchemicals in measured quantities or the employment of bacterial agentsand where the water flow far exceeds the anticipated amount thesetreating elements are washed out and incompletely treated sewage isdischarged into and pollutes the adjacent rivers and streams. In arecent test a sewer line which was assumed to be carrying three hundredthousand gallons of water per day to a sewer treatment plant was foundto be carrying nearly nine hundred thousand gallons and the diiferencewas made up almost entirely of water of infiltration from outside theline. Some sewer lines and in fact most sewer lines are laid in ditchesso deep that the water level in the ditch may rise to such a point as tocreate an external pressure head that is much in excess of the internalpressure and where leaky joints are present the extent of the entry ofwater of infiltration may be very great.

It is common practice to provide matching male and female ends upon thesewer pipe sections of such configuration as to leave annular chambersinto which sealing compounds of either a hydraulic cement mixture or abituminous mixture are poured. Many of the faulty joints heretoforeconstructed are caused by the formation of pockets of trapped air in thesealing compounds and a primary object of this invention is to provide ajoint which will be waterproof against either internal or externalpressures, will be free of air pockets and will be proof against theentry of roots.

The invention will be best understood by reference to the accompanyingdrawing wherein:

Fig. 1 is a longitudinal sectional view; and

Fig. 2 is a transverse vertical sectional view through a sewer pipejoint constructed in accordance with the invention.

In the drawing 5 designates a pipe section having a female or hell endportion 6 which terminates in the annular wall 1 and is internallybeveled at 8. A companion male pipe section 9 terminates in a nipple orneck extension I 0 having a beveled end II which serves, by its entryinto the beveled seat 8 of the female member to aid in centering the twosections with respect to each other. The external diameter of neckextension [0, with respect to the internal diameter of wall 1, is suchas to leave an annular chamber [2 between them. The outer end of thischamber I2 is closed by a lateral circumferential flange I3 of pipesection 9. An opening 14 through wall 1 provides a port through which asealing compound l5 may be poured. The compound employed has thecharacteristic that it is of a bituminous water repellent nature,plastic under heat, hard and dense when cold, non-granular, very quicksetting when cold and one which gets cold and hard very quickly,especially when contacting the air. To prevent the formation of airpockets as the hot compound is poured into the chamber [2, one or moreopenings I6, I61: are formed in the neck extension In so that any airtrapped in the lower portion of the chamber may escape as the level ofthe compound in the chamber rises. As soon as the rising compoundreaches the upper end of the opening IE it seals said opening by itscapacity for quick cooling. As the level rises farther any additionaltrapped air may escape through openings I6a which openings will in theirturn be sealed as the quickly hardening compound enters them. It is tobe noted that the vent openings 16 and 16a are formed in a portion ofthe pipe that is protected from the surrounding dirt of the trench. Alsothese openings are accessible to workmen. Since these sewer pipesections are relatively short, it will be possible for a workman toreach through one of them with a stopper, such as an old piece of rubberbelting on a stick, to lay over the openings 16, [6a if the sealingcompound does not harden quickly enough to prevent some of it fromentering the interior of the sewer line. pounds of the characterdescribed are commonly in use and may be purchased at any plumbingsupply house. They tenaciously adhere to the material of either cementor terra cotta pipes, and seal all joints in a waterproof and root proofmanner.

It will be noted that the inner end of the neck Sealing comextension l0contacts the confronting end of the female section before the flange l3contacts the front end of the wall I of the bell end. This accomplishesthe double purpose of preventing the sealing compound from runningdirectly out of the chamber 12 and into the interior of the sewer line,and of leaving flange I2 spaced far enough away from the end of wall 1to permit some of the sealing compound to enter and seal said space.

Having describe-:1 my invention, what I claim is:

l. A pipe line comprising matching male and female sections one of whichterminates in a bell end and the other of which terminates in a neckextension which enters said bell end and lies in such spaced relationthereto as to leave a circumferential chamber therebetween thema terialof the bell end having an opening formed therethrough at the top thereoffor the entry of a flowable sealing compound into said chamber, a flangeupon the male member which closes the open mouth of the bell, an airvent opening formed through the wall of the lower portion of the neckextension and establishing communication between said chamber and theinterior of the male pipe section, a quick settingsealing compound insaid chamber, the inner end of the neck extension having closelycontacting engagement with a confronting face of the bell end, to aid inconfining the sealing compound to the circumferential chamber.

2. A pipe line comprising matching male and female sections one of whichterminates in a bell end and the other of which terminates in a neckextension which'enters said bell end and lies in such spaced relationthereto as to leave a circumferential chamber therebetween the materialof the bell end having an opening formed there through at the topthereof for the entry of a flowable sealing compound, a flange upon themale member which closes the open mouth of the bell, an air vent openingformed through the neck extension and establishing communication betweensaid chamber and the interior of the male pipe section and a sealingcompound in said chamber, said vent opening being at the bottom side ofthe neck extension and additional like vent openings at points higher upthe sides of the neck extension, the inner end of the neck extensionhaving closely contacting engagement with a confronting face of the bellend to aid in confining the sealing compound to the circumferentialchamber.

3. A'pipe line comprising matching male and female sections one of whichterminates in a bell end and the other of which terminates in a neckextension which enters said bell end and lies in such spaced relationthereto as to leave a circumferential chamber therebetween the materialof the bell end having an opening formed therethrough at the top thereoffor the entry of a sealing compound, a flange upon the male member whichsubstantially closes the open mouth of the bell but lies in slightlyspaced relation thereto, an air vent opening formed through the neckextension at thebottom :side thereof and establishing communicationbetween sai-dlchamber and the interior of the male pipe section and asealing compound in said chamber. said sealing compound being of abituminous, non granular, thermo plastic, quick cooling and settingnature and one which tenaciously adheres to the walls of the pipesections, the inner end of the neck extension contacting an abuttingface of the female section to aid in confining the sealing compound tothe circumferential chamber.

NATHANIEL P.. YOUNG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 340,046 Hurlbut Apr. '13, 18861,881,943 Rader Oct. 11, 1932 2,322,587 Payne June 22, 1943

